The purpose of the format is to do cool and flashy things instead of always doing the most powerful or correct thing, and that subjectivity to deckbuilding is what makes the format great
Grade: A Concordia Pegasus is a weak card
Pole Positions effect could go on forever without a single phase within a turn ending and when that happens, infinite loops could be created
Dealing two damage per sacrificed artifact is no joke, and can add up extremely quickly
Consequently, Xyz Monsters cannot normally be used as material for a Synchro or Xyz Summon (unless specifically permitted, such as with the Pendulum Effect of "Xiangke Magician", or by monsters that explicitely demand them as their material), and any effects that refer to, or modify, the Level of a monster (such as "Gravity Bind", most Ritual Spell Cards, or "Harmonic Waves") do not affect Xyz Monsters and cannot be applied to them
Bristlebane Battler Bristlebane Battler starts as a 1/1, but each subsequent creature takes off a -1/-1 counter until its a 6/6, and for just 2 mana